[mrbb] “I am not using yet due to a missing serial number ( an interesting story but unimportant to this post).”
If it’s a repeated click like a metronome, that IS important, because it indicates that you are running in trial mode.
If it’s a single click, zoom way in and see if there’s something amiss with your audio, especially a leftover bit that’s on a separate track or even on the same track.
Gary Kleiner
Learn Vegas and DVD Architect
http://www.VegasTrainingAndTools.com